[skip changelog] Add stats fetching from Arduino CDN using AWS Athena

.github/tools/fetch_athena_stats.sh

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+#!/usr/bin/env bash
+
+# This script performs the following:
+# 1. Run the query, use jq to capture the QueryExecutionId, and then capture that into bash variable
+# 2. Wait for the query to finish running (240 seconds).
+# 3. Get the results.
+# 4. Json data points struct build
+
+# Expected env variables are:
+# AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY for accessing AWS resources
+# AWS_ATHENA_SOURCE_TABLE
+# AWS_ATHENA_OUTPUT_LOCATION
+# GITHUB_REPOSITORY
+
+set -euo pipefail
+
+! read -r -d '' query << EOM
+select
+replace(url_extract_path("d.url"), '/arduino-cli/arduino-cli_', '') as flavor,
+count("id") as gauge
+from ${AWS_ATHENA_SOURCE_TABLE}
+where "d.url" like 'https://downloads.arduino.cc/arduino-cli/arduino-cli_%'
+and "d.url" not like '%latest%' -- exclude latest redirect
+and "d.url" not like '%alpha%' -- exclude early alpha releases
+and "d.url" not like '%.tar.bz2%' -- exclude very old releases archive formats
+group by 1
+EOM
+
+queryExecutionId=$(
+aws athena start-query-execution \
+--query-string "${query}" \
+--query-execution-context "Database=demo_books" \
+--result-configuration "OutputLocation=${AWS_ATHENA_OUTPUT_LOCATION}" \
+--region us-east-1 | jq -r ".QueryExecutionId"
+)
+
+echo "QueryExecutionId is ${queryExecutionId}"
+for i in $(seq 1 120); do
+  queryState=$( aws athena get-query-execution \
+  --query-execution-id "${queryExecutionId}"  \
+  --region us-east-1 | jq -r ".QueryExecution.Status.State"
+  );
+
+  if [[ "${queryState}" == "SUCCEEDED" ]]; then
+      break;
+  fi;
+
+  echo "QueryExecutionId ${queryExecutionId} - state is ${queryState}"
+
+  if [[ "${queryState}" == "FAILED" ]]; then
+      exit 1;
+  fi;
+
+  sleep 2
+done
+
+echo "Query succeeded. Processing data"
+queryResult=$( aws athena get-query-results \
+--query-execution-id "${queryExecutionId}" \
+--region us-east-1 | jq --compact-output
+);
+
+! read -r -d '' jsonTemplate << EOM
+{
+"type": "gauge",
+"name": "arduino.downloads.total",
+"value": "%s",
+"host": "${GITHUB_REPOSITORY}",
+"tags": [
+"version:%s",
+"os:%s",
+"arch:%s",
+"cdn:downloads.arduino.cc",
+"project:arduino-cli"
+]
+},
+EOM
+
+datapoints="["
+for row in $(echo "${queryResult}" | jq 'del(.ResultSet.Rows[0])' | jq -r '.ResultSet.Rows[] | .Data' --compact-output); do
+  value=$(jq -r ".[1].VarCharValue" <<< "${row}")
+  tag=$(jq -r ".[0].VarCharValue" <<< "${row}")
+  # Some splitting to obtain 0.6.0, Windows, 32bit elements from string 0.6.0_Windows_32bit.zip
+  split=($(echo "$tag" | tr '_' '\n'))
+  if [[ ${#split[@]} -ne 3 ]]; then
+    continue
+  fi
+  archSplit=($(echo "${split[2]}" | tr '.' '\n'))
+  datapoints+=$(printf "${jsonTemplate}" "${value}" "${split[0]}" "${split[1]}" "${archSplit[0]}")
+done
+datapoints="${datapoints::-1}]"
+
+echo "::set-output name=result::$(jq --compact-output <<< "${datapoints}")"

.github/workflows/arduino-stats.yaml

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+name: download-stats
+
+on:
+  schedule:
+    # run every day at 12:00:00
+    - cron:  '* 12 * * *'
+
+jobs:
+  push-stats:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Fetch downloads count form Arduino CDN using AWS Athena
+        id: fetch
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.STATS_AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.STATS_AWS_SECRET_ACCESS_KEY }}
+          AWS_ATHENA_SOURCE_TABLE: ${{ secrets.STATS_AWS_ATHENA_SOURCE_TABLE }}
+          AWS_ATHENA_OUTPUT_LOCATION: ${{ secrets.STATS_AWS_ATHENA_OUTPUT_LOCATION }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+        run: |
+          # Fetch jq 1.6 as VM has only 1.5 ATM
+          wget -q https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 -O jq
+          chmod +x jq
+          PATH=${{ github.workspace }}:$PATH
+          .github/tools/fetch_athena_stats.sh
+
+      - name: Send metrics
+        uses: masci/datadog@v1
+        with:
+          api-key: ${{ secrets.DD_API_KEY }}
+          # Metrics input expects YAML but JSON will work just right.
+          metrics: ${{steps.fetch.outputs.result}}
+
+      - name: Report failure
+        if: failure()
+        uses: masci/datadog@v1
+        with:
+          api-key: ${{ secrets.DD_API_KEY }}
+          events: |
+            - title: "Arduino CLI stats failing"
+              text: "Stats collection failed"
+              alert_type: "error"
+              host: ${{ github.repository }}
+              tags:
+                - "project:arduino-cli"
+                - "cdn:downloads.arduino.cc"